It'll be the other way

It's nice to see that somebody gets my point, here. There would have been a number of advantages, both pragmatic and ideological had Sun adopted GPLv3 for OpenSolaris upon the finalisation of that licence, notably the strengthened patent language in the licence compared to GPLv2 (which recent events show to be moderately useful, even if Sun arguably wanted to sit on the fence with regard to their own patents), and as already noted, the ability to adopt GPLv2-or-later-licensed code from Linux, thus addressing one of the largest and longest running complaints about Solaris on x86 when compared to the Free UNIX variants: hardware and driver support.